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Merck

Cell-permeable GPNA with appropriate backbone stereochemistry and spacing binds sequence-specifically to RNA.

Chemical communications (Cambridge, England) (2005-02-23)
Anca Dragulescu-Andrasi, Peng Zhou, Gaofei He, Danith H Ly
RÉSUMÉ

Guanidine-based peptide nucleic acid (GPNA) with a d-backbone configuration and alternate spacing binds sequence-specifically to RNA and is readily taken up by both human somatic and embryonic stem (ES) cells.

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Sigma-Aldrich
N-Glutaryl-L-phenylalanine p-nitroanilide, protease substrate